論文の公開元へThe acuminata species-group of Unaspis, with particular reference to the perivulvar disc pores (Sternorrhyncha: Coccoidea: Diaspididae)
概要
In the present study, four species of Unaspis are dealt with: Chionaspis acuminata
Green, 1896, originally described from Pundaluoya, Ceylon, as occurring on Ardisia sp.,
was redescribed and figured by Green (1899) on the basis of the original material and
a further collection made at the same locality from an unidentified shrub. This species
was designated by MacGillivray (1921) for the type-species of his new genus Unaspis.
Since that time, Unaspis acuminata (Green) has been recorded mainly from tropical Asia
and from a broad range of plants. In the present study, samples collected in Nepal, South
India, Malaya, and the Philippines and from diverse plants are identified with Unaspis
acuminata on the basis of Green’s redescription and figure.
At the end of his redescription of C. acuminata, Green (1899) states: ‘A form
collected at Kandy [in Ceylon] has the female puparium dark chocolate brown [while in
C. acuminata ‘Colour pale brownish fulvous, sometimes dark brown’]. The median lobes
of pygidium are rather smaller and shorter than in typical examples, and more distinctly
serrate on their free edge.’ This form was called C. acuminata atricolor by Ayyar, and
later described by Green (1922) under this name (which is, therefore, attributable to the
latter author) on the basis of material collected at Maha Illuppalama, Kandy, on Carrisa
sp. and recorded from South India on Carrisa, Tamarindus, and Ficus. Rao (1949)
described this form as a distinct species, ‘U. atricolor (Green)’. I have found this species
in my collection from South India.
Another form, which is very close to U. atricolor but apparently different from
the latter, occurs in Sabah (northeastern Borneo) and is described in this paper as a new
species, U. pallidicolor.
Unaspis turpiniae, originally ‘U. acuminata Green var. turpiniae’ (Takahashi, 1934),
was described from material collectred at ‘Kahodai near Hassenzan’ [these locality
names correspond to 佳保台 , 972m, and 八仙山 , with the summit 2366m; the altitude
of the collection spot was not mentioned, but the spot should have been in montane
conditions around an altitude of 1000m], Formosa [Taiwan], as occurring on Turpinia
formosana. This scale insect has also been recorded from southern Japan on Turpinia
ternata.
These four species are very similar to each other in the characters of the adult
females. They agree particularly in having the perivulvar disc pores occurring with a
considerable concentration in the numerical pattern 4(6-6)(4-4)=24, called in this paper
‘the acuminata-formula’. This pattern of arrangement of perivulvar disc pores may occur
in other parts of the genus, too. The matter here concerns the outstanding frequency of
this formula in contrast with those of the other arrangements in the same samples (see
section IIa).
Probably all of these species are ovoviviparous, so that their perivulvar disc pores
should have no function (in this connection, see Takagi, 2022), and the persistent
occurrence of this organ with a concentration in a definite pattern, thus affording a static
trait, may need an explanation.
Abbreviations. In descriptions, explanations of figures, tabular indications, etc., the
abbreviations ‘prth’, ‘msth’, ‘mtth’ are used for the pro-, meso-, and metathorax, and ‘abd
I~VIII’ for the first to eighth abdominal segments.
Depository of the type-slide. ...
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